As shown in the illustrated typical self-contained refrigerant recovery unit, what is the purpose of the pump-down solenoid valve and the restricted orifice? See illustration GS-RA-34.

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preparation for a recovery unit shutdown where the next job will be to recover a different type of refrigerant

Answer

preparation for transitioning from the direct liquid recovery mode to the direct vapor recovery mode

Answer

preparation for transitioning from the direct vapor recovery mode to the direct liquid recovery mode

Answer

preparation for a normal recovery unit shutdown where the next job will be to recover the same type of refrigerant

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